Armor-plate for treasuries, safes, and the like.



F. P. GEORGI. ARMOR PLATE POR TREASURIES, SAMS, AND THB LIKE.

APPLICATION FILED DEU. 2T* 1911` Patented Fb. i913.

sTATEs siren@ .tBMOR-PLATE FOR TREASURIES, SAFES, ND THE {Spcccation of Letters atent.

Patenten Feb., 2li, 19330 ippneatmn aise :emmer si, ieu. serial ue. esame.

meer conceive:

e ifs ec Fmonci lfiui, Gnonci, if" meistens subject of 'tiie King o'f enel :iv resident of Niederpcnnenstiel, i. fine, Erzgebirge, tine Saxony, Germany, lieve inntecl new useul llfmor-lete for To 0539i speciiication. on relates to 1inew ermors futile cil attempts io pierce sutogenic hole-burners.

esccompcnyinw clrewing represents n oersepct'ice View of armor plate embodyine' *foy nu treasuiies, saines, enti the like were loy ineens of armor-plates protectecl from enieeing 'ny force, thermor-plates being now-moms provided with so hard a crust that it is not possible to oierce them by means ci mechanically driven tools. As is Well known, the protection aiortlecl by such plates has, however, been rencleretl illusory oy ilie aubogenic hole-burners, which intlie last' years have come into use. The capacity of these tremendous tools of piercing iron anclsteel is basetl upon the fact, tha-t the metal is by the lientl of the burners brought up io its igniting tempen :1t-ure and is by' burning ,withthe supplied oxygen turned into melted black oxiti of liron which Hows ofi and thus contributed 'izo the formation of a liole'in the plate.

n order' to ena-ble a given supply of liest, such as is represented ley the said autogenic noie-burners, to produce the ignition anti thereby 'time spontaneous continuation othe oxidation'of a metal, it is necessary, that che liringnomt be attained ano maintained.

"liis is ei'ifected thel more easily, the lower temperstur'e of'igniiion of the metal is, higliec its own heeft of combustion is, the more badly the nene generated Hon some place oi? ine metal can escape, and the lower tine iieet- 4ducting power of the metal is. e experiments made by myself liznowieclge, insitalso s-lie autogenic iiole-v action re is o protection possible luy suitable metal. According to ciments im armor-plate of pure s proved to ce sucientiy capable of offering resistance against the flame of the said noie-burner; as 'this tialne is not ulole to melt, c hole ihroun'li the plete. The reason for iliis property ille nickel lies in that iie 'iiing int necessary for the vfoi-finition ci the melting oxitl is not ettained.

To burn nickel is more cliiicultJ than to burn iron. This is borne out by the friet., elec :eri'ic nickel con be fi'eecl from its iron ineens tile Bessemer process, since ii ifa i s nes. Evidently, 'to pnt it in other terms, i-iie nickel burns more slowly ai tine same temperature 'than tine ion. This ineens, chst quick combustion, sucli es is necessary for ille spontaneous combustion, requires e higher temperature, and consequentiy ille iring-gooint oi3 the nickel must 1oe considerably higher than that of ine iron. `Furtliel'more it is to oe taken into consideration, that the 'clock oxid formed by burning che iron is melted :it the liringpoint of the iron and as it flows oii' constantlyfresh iron is exposed to the action of the oxygen in the ilome of tile aiuto-l genic hole-burner, while the nickel on the contrary by the combustion is turned `into protoxid of nickel, which is much less usible than nickel, so that thereby the metal is protectedjrom further action of the oxygen, as the transmission of the ignition` is Witnesses:

SIDNEY RICH, MAX J. BENNDGRF.

he iron clone which `burns anti inus es- 

